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arXiv · 1305.0894

Magnetic field induced band insulator to Mott insulator transformations in 4-component alkali fermions at half-filling

J. Jaramillo·S. Greschner·T. Vekua
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Abstract

Under the influence of an external magnetic field and spin-changing collisions, the band insulator (BI) state of one-dimensional (1D) s-wave repulsively interacting 4-component fermions at half-filling transforms into Mott insulator (MI) states with spontaneously broken translational symmetry: a dimerized state for shallow lattices and a N{é}el state for deep lattices via an intermediate topological state. Since a BI has vanishing entropy per particle, these MI phases could be particularly inviting for experimental realization under the similar conditions as those for $^{40}$K atoms [1], provided the magnetic field is changed adiabatically.

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J. Jaramillo, S. Greschner, T. Vekua. 2013-05-04. Magnetic field induced band insulator to Mott insulator transformations in 4-component alkali fermions at half-filling. https://doi.org/10.1103/physreva.88.043616

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